Abokin ciniki-uwar garke fasahar

abokin ciniki-uwar garke fasahar samar da biyu m hulda matakai - uwar garke kuma abokin ciniki, da dangantakar dake tsakanin su a kan wata cibiyar sadarwa.

Servers ake kira da matakai da alhakin goyon bayan da database da fayil tsarin, da kuma abokin ciniki - da matakai da cewa ka aika request da kuma jira don wani martani daga uwar garke.

Client-uwar garke model da ake amfani a gina da tsarin bayanai aiki a kan tushen da database, kazalika da lambar akwatin gidan waya tsarin. Akwai abin da ake kira fayil-uwar garke gine cewa shi ne muhimmanci daban-daban daga abokin ciniki-uwar garke.

Data a cikin fayil uwar garke tsarin adana a fayil uwar garke (Novell NetWare ko WindowsNT Server), kuma sũ, a sarrafa ta hanyar aiki na workstations "tebur database", kamar Access, Paradox, FoxPro, da dai sauransu

Database located a workstation, da kuma data magudi yi da dama zaman kanta da kuma uncoordinated tsari. All data haka daukar kwayar cutar a kan wani cibiyar sadarwa uwar garke da workstation, wanda slows saukar da gudun bayanai aiki.

abokin ciniki-uwar garke fasahar da aka aiwatar da aiki na biyu (a kalla) aikace-aikace - abokan ciniki da kuma sabobin cewa raba ayyuka tsakanin su. Domin ajiya da kuma kai tsaye magudi da data uwar garke amsa, wani misali na wanda za a SQLServer, Oracle, Sybase, da sauransu.

Mai amfani dubawa na samar da wani abokin ciniki tushen gina wadda amfani da musamman kayan aikin ko tebur database. Koma bayan tunanin data aiki ne da hukuncin kisa jera a kan abokin ciniki, da kuma jera a kan wani uwar garke. Yin request ga uwar garke da aka yi da abokin ciniki, yawanci a cikin SQL harshe. Samu buƙatun sarrafa ta uwar garke kuma abokin ciniki (s), sakamakon da aka mayar da su.

A data aka sarrafa a wannan wuri inda suke adana - a kan uwar garke, don haka babban adadin su ba su aika fadin cibiyar sadarwa.

A abũbuwan amfãni da wani abokin ciniki-uwar garke gine

abokin ciniki-uwar garke fasaha ya kawo bayanai da irin ingancin tsarin:

• aMINCI

Data gyara aka yi database uwar garke ta yin amfani da ma'amala inji da yake koyar da tara Properties irin wadannan ayyuka kamar: 1) atomicity, wanda ya samar da bayanai mutunci ga kowane ma'amala kammala. 2) 'yancin kai na ma'amaloli daban-daban masu amfani. 3) kuskure haƙuri - ceton da sakamakon da ma'amala.

• Scalability, watau, Tsarin iya aiki ne ba a dogara a kan yawan masu amfani da adadin bayanai ba tare da canza software amfani.

abokin ciniki-uwar garke fasahar goyon bayan dubban masu amfani da gigabytes na bayanai a dace hardware dandali.

• Tsaro, watau, m data kariya daga samun dama marar izini.
• Sassauci. A aikace-aikace da aiki tare da bayanai, ware ma'ana yadudduka: mai amfani dubawa. dokokin dabaru aiki. data management.

Kamar yadda muka rigaya muka gani, a fayil-uwar garke fasaha, duk uku yadudduka ake hada a cikin guda monolithic aikace-aikace da cewa gudanar a kan wani workstation, da kuma duk canje-canje a cikin yadudduka dole kai ga wani canji na aikace-aikace, daban-daban versions na abokin ciniki da kuma uwar garke, kuma kana so su gudanar da wani software kyautayuwa a kan duk workstations .

Client-uwar garke fasahar a wani biyu-bene aikace-aikace na samar da dukkan ayyuka da samuwar na mai amfani da ke dubawa a kan abokin ciniki, da kuma duk ayyukan da bayanai database management - a kan wani uwar garke, kasuwanci mulki iya yi duka da uwar garke kuma abokin ciniki.

Uku-matakin aikace-aikace damar wani tsaka-tsaki matakin, wanda aiwatar da kasuwanci dokoki, wanda su ne mafi m aka gyara.

Mahara matakan ba da damar m da kuma kudin-yadda ya kamata daidaita data kasance aikace-aikace don kullum updatable kasuwanci bukatun.